With the use of modelling clay and beans, students will simulate meiosis and mitosis while learning about finding of allopurinol, which made it possible to eat watermelon without seeds.
What differences exist between the cells created during meiosis?With the same chromosome count in their parent cell, each of the two daughter cells produced during mitosis is identical to the parent cell. While meiosis creates four distinct clones, each of which contains half as many chromosome as the parent cell, it also results in the death of the original cell.
What distinguishes this mitotic stage from the corresponding meiotic stage in phase I?In meiosis, cells divide twice rather than once, while mitosis only happens once. Mitosis and cytoplasm division result in the production of two daughter cells, whereas meiosis results in the production of four daughter cells. children's cells.
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While this octopus has yet to be given a scientific name, its likely classification is shown above. How is it that we can predict this information?
Answer:The scientific name for the common octopus is Octopus vulgaris.
Explanation:The scientific name for the common octopus is Octopus vulgaris. The scientific name for the common european squid is Loligo vulgaris.
Select the correct answer.
Which term defines a well-supported, explanation of an occurrence of a natural phenomenon?
OA.
OB.
O C. observation
O D. theory
hypothesis
bias
Reset
Next
The term that defines a well-supported, explanation of an occurrence of a natural phenomenon is theory. Hence Option (B) is correct.
Why is scientific theory significant?A scientific theory is a well-supported explanation of a feature of the natural world that is based on a body of facts that have been repeatedly verified via observation and testing. Through the use of the scientific method, theories in science are developed. A hypothesis is developed by observation and study, which is followed by testing.
In the event that the theory is not refuted, it will be examined and tested repeatedly. By placing observations and experiments in a framework, scientific theories serve as organizing principles and provide objectivity. Even studies conducted under one "wrong" hypothesis will eventually lead to the theory's extinction and contribute to knowledge advancement.
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The correct question is:
Select the correct answer.
Which term defines a well-supported, explanation of an occurrence of a natural phenomenon?
A. observation
B. theory
C. hypothesis
D. bias
Answer:
Hypothesis.
Explanation:
a large plant that grows in a warm, swampy environment and faces substantial herbivory most likely . group of answer choices has a much smaller than usual difference between its gpp and its npp. allocates a relatively large proportion of its npp to roots. allocates a relatively large proportion of its npp to secondary compounds. all of the above
has a sizable percentage of its npp devoted to secondary chemicals. This is due to the possibility of secondary chemicals, such as poisons and other chemical defences, aiding in the plant's herbivore defence.
The warm, swampy atmosphere may also encourage the development of bigger plants with more powerful roots that can help them anchor themselves and take up nutrients from the nutrient-rich soil. The plant can thrive under these circumstances by allocating a large part of NPP to the roots. Life on Earth depends on a wide variety of creatures called plants. Through the process of photosynthesis, they are primary producers that turn light, water, and carbon dioxide into energy. The development and reproduction of the plant are then fueled by this energy.
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1. As we increase our latitude heading north we can expect the vegetation to
A. Increase in height and density, with fewer cold weather adaptation.
B. Decrease in height and density, with more cold weather adaptation
C. Decrease in heigh and density, with fewer cold weather adaptation
2. Factors influencing where plants can grow include all of the following except :
A. Temperature
B. Animal species
C. Latitude
As we increase our latitude heading north we can expect the vegetation to - Decrease in height and density, with more cold ecosystem adaptation.
Factors influencing where plants can grow include all of the following except : Animal species.
What is Vegetation?The plants that grow in a certain area or region are referred to as vegetation.It is a collective name for all the many kinds of trees, shrubs, grasses, and other plants that make up an area's flora.It is used to describe plant life in a certain environment.The ecosystem's most important component, vegetation offers vital ecosystem services like oxygen production, carbon sequestration, and habitat for species.The kind and distribution of vegetation in a location can be influenced by the climate, soil type, and other environmental factors, as well as by human activity.Biodiversity is a term used to describe the variety of plant and animal species found in a given area, particularly the variety of flora.To learn more about vegetation from the given link :-
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quuizlet in an in vitro polymerization reaction of f-actin from its g-actin subunits, there is a lag phase (rate-limiting stage). what happens during this lag phase? a: f-actin is nucleated b: f-actin reaches a steady state c: f-actin exchanges nucleotides d: f-actin hydrolyzes atp e: f-actin undergoes treadmilling
F- actin is nucleated. Nucleation is the rate-limiting step in the polymerization of actin filaments.
Bacteria prepare for cell division during the lag phase, which is a dynamic, structured, adaptive, and adaptable time period.
Actin nucleation process is typically thought to be responsible for the delay or lag phase at the beginning of the polymerization of actin by neutral salt. However, when Ca2+-containing actin is polymerized with MgCl2, a lag phase still exists when nucleation is avoided by using phalloidin-stabilized nuclei.
The creation of a tiny aggregate made up of three actin monomers is known as the nucleation phase of actin polymerization. The reversible addition of monomers to both ends of an actin filament allows it to grow, but only one end—the plus end—expands five to ten times as quickly as the minus end.
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Which perspective offers the best explanation for schizophrenia?A. PsychodynamicB. BehaviorialC. BiopsychologicalD. Humanistic
The best perspective for schizophrenia is Biopsychological. Disturbances in thought, perception, emotional reactivity, and social interactions are hallmarks of schizophrenia.
A mental condition called schizophrenia is characterized by disturbances in thought, perception, emotional reactivity, and social relationships. Although each person's experience with schizophrenia is unique, the condition is often chronic and can be both severe and incapacitating.
Schizophrenia symptoms include psychotic manifestations like hallucinations, delusions, and thought disorder (abnormal ways of thinking), as well as decreased emotional expression, decreased motivation to achieve goals, difficulty forming social connections, motor impairment, and cognitive impairment. Schizophrenia is frequently seen from a developmental viewpoint, despite the fact that symptoms typically appear in late adolescence or early adulthood. Children occasionally show signs of cognitive impairment and strange behaviour, and the presence of several symptoms over time indicates a more advanced stage of the condition. This trend might be caused by environmental factors such prenatal or early life stress as well as disturbances in brain development. This point of view feeds the belief that early interventions will alter the course of schizophrenia, which, when left untreated, frequently has highly devastating effects.
The biopsychological approach is a significant school of psychology that seeks to pinpoint the biological basis for emotion, cognition, and behaviour.
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Option C is Correct. The biopsychological viewpoint is the most effective one for schizophrenia. Schizophrenia is characterized by disturbances in thought, perception, emotional reactivity, and social relationships.
Schizophrenia is a mental illness marked by abnormalities in thought, perception, emotional reaction, and social interactions. While every individual's experience with schizophrenia is different, the illness is frequently chronic and can be quite severe or even incapacitating.
In addition to decreased emotional expression, decreased motivation to achieve goals, difficulty forming social connections, motor impairment, and cognitive impairment, schizophrenia symptoms also include psychotic manifestations like hallucinations, delusions, and thought disorder (abnormal ways of thinking).
Despite the fact that symptoms of schizophrenia often manifest in late adolescence or early adulthood, the disorder is frequently viewed from a developmental perspective. Children can display unusual behavior and indicators of cognitive impairment.
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why was the garden pea a good choice as an experimental organism in mendel's work? naturally crosbred
Pea plants are a wonderful option because they grow quickly and are simple to take care of. They also have a number of distinguishing features that can change.
He selected peas because they are simple to grow, have been used in comparable trials, and can be sown every year. Stamen and stigma, the male and female reproductive organs of the pea flower, are both present. Before the flowers open, self-pollination takes place, resulting in the production of offspring from a single plant.
The garden pea's blooms seal securely during self-pollination to minimize inadvertent or unintentional fertilizations that would have decreased the precision of Mendel's data, which is one of the reasons it was a great choice of model system for studying heredity.
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nerve cells, receive stimuli and transmit action potentials to other neurons or to effector organs. They are organized to form complex networks that perform the functions of the nervous system.
Yes, that is correct. Nerve cells, also known as neurons, are the basic units of the nervous system. They receive stimuli from the environment or from other cells and transmit electrical signals, known as action potentials, to other neurons or to effector organs such as muscles and glands.
Neurons are specialized cells that have the ability to generate and conduct electrical impulses, known as action potentials. They have a cell body, dendrites, and an axon. The dendrites receive signals from other neurons and the axon transmits signals to other neurons or effector organs. The electrical impulse or action potential is generated at the axon hillock and travels down the axon to the axon terminals where it triggers the release of chemical messengers called neurotransmitters, which bind to receptors on the postsynaptic membrane of the receiving neuron or effector organ.
Neurons are organized to form complex networks that perform the functions of the nervous system. These networks, which include the brain and spinal cord, allow for the processing, integration, and coordination of information, allowing the organism to respond to its environment.
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Neurons commonly referred to as nerve cells are the fundamental components of the neurological system. They are stimulated by their surroundings or by other neurons, and they respond by producing electrical impulses known as action potentials.
These action potentials are then transmitted along the neuron's axon, where they are passed on to other neurons or to effector organs such as muscles or glands. Neurons are specialized cells that are able to transmit and process information quickly and efficiently.
Neurons are organized into complex networks that perform the functions of the nervous system, including sensation, perception, learning, memory, and movement.
These networks are composed of many different types of neurons, each with specialized functions and properties. For example, some neurons specialize in sensing different types of stimuli, while others specialize in transmitting signals over long distances.
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an image from a microscope including one or more colors on a black background is likely an example of
Darkfield microscopy is most frequently displayed in a microscope image that has one or more colors on a background of black.
The specimens are brilliant against a black backdrop when viewed under darkfield microscopy. Placing a patch stop filter inside the filter holder will allow brightfield microscopes with condensers to be quickly changed to darkfield microscopes. The microscope's direct light is refracted by the filter.
To illuminate unstained samples so they look brightly lit against a dark background, dark-field microscopy is the best method. A vivid image of the specimen is created by light flowing through the specimen at oblique angles and reflecting into the microscope objective after being refracted, diffracted, and reflected into the objective by an opaque stop in the condenser, which previously prevented direct light.
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Correct Question:
An image from a microscope including one or more colors on a black background is likely an example of ________.
genes that are likely inherited together due to their physical proximity
Linked genes are likely inherited together due to their physical proximity.
Genes that are sufficiently near to one another on a chromosome have a tendency to "stay together," and the alleles of those genes that are together on a chromosome are more likely to be passed down as a pair. Genetic linkage is the term for this phenomenon.
The likelihood of two genes inheriting together increased as two genes' distance from one another on a chromosome increased. On the other hand, genes that were further apart on the same chromosome were more likely to be split apart during recombination.
A group of DNA polymorphisms that are often inherited together is referred to as a haplotype along a single chromosome.
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Genes that are sufficiently close together on a chromosome will tend to "stick together," and the versions (alleles) of those genes that are together on a chromosome will tend to be inherited as a pair more often than not.
This phenomenon is called genetic linkage.
The more apart two genes were on a chromosome, the more likely it was that they would inherit together. On the other hand, recombination was more likely to result in the separation of genes that were spaced apart on the same chromosome. A haplotype on one chromosome is a collection of DNA variations that are typically inherited together.
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Can someone help me with these 2 questions?
Answer:
It should be the first two on the first question and Both A and B for the second question
Explanation:
Which ocean zone is associated with the continental shelf?
OA. Epipelagic
B. Mesopelagic
C. Abyssopelagic
D. Hadalpelagic
Epipelagic Zone is associated with the continental shelf
What is continental shelf ?A continent's oceanic margin is referred to as a continental shelf. The seven major geographical divisions of Earth are called continents. The shelf break, a drop-off point on a continent's coastline, is the end of the continental shelf.
The area of the ocean that lies on the continental shelf is referred to as the "Epipelagic Zone," also called the "Sunlight Zone." From the surface, it descends 200 metres. The Greek words pelagikos, which means "of the sea," and epi, which means "at the surfaces," are combined to form the word epipelagic.
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What is the book "microbiology laboratory theory and application 4th edition" discussing?
"Microbiology Laboratory Theory and Application, 4th Edition" is likely a laboratory manual or textbook that is used in a course on microbiology.
The book likely includes information and exercises on the study of microorganisms, including bacteria, viruses, fungi, and protozoa. It may cover topics such as the basic biology and genetics of microorganisms, their role in the environment and human health, and techniques used to culture and study them in the laboratory. The text may also include chapters on laboratory safety, equipment, and procedures, as well as information on how to interpret laboratory results. The 4th edition likely includes updates and new information on recent advances in the field of Microbiology Laboratory .
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what is the advantage of using multiple restriction enzymes to cut the dna during dna fingerprinting?
The major advantage of using multiple restriction enzymes to cut the DNA during DNA fingerprinting is that it allows us to have multiple sets of data which can allow us to have a better analysis.
DNA fingerprinting which is also known DNA profiling, genetic fingerprinting, DNA typing is basically a genetic method of isolating as well as identifying variable elements which occur within the base-pair sequence of DNA. It is based on certain sequences of highly variable DNA which are known as minisatellites and are repeated within genes.
This process involves the use of restriction enzymes which perform the function of cutting the DNA at specific sites. Using multiple restriction enzymes gives us the advantage as we obtain multiple sets of DNA sequences which can allow a more thorough analysis.
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These professionals crime scene reconstructions are considered demonstrative evidence
Investigators employ the method of crime scene reconstruction to ascertain the sequence of events that took place during a crime.
A range of methods, including photography, mapping, and measuring, may be used in the reconstruction, which is based on the physical evidence discovered at the crime scene. Reconstructing a crime scene is intended to offer a logical and factually accurate account of what happened that may be used as evidence in court. The reconstruction is utilised to clarify and highlight other pieces of evidence in the case since it is regarded as demonstrative evidence. Professional crime scene investigators study the scene and offer a thorough reconstruction of the events that took place using a combination of scientific and forensic approaches.
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Specialists utilize the technique for crime location reproduction to determine the succession of occasions that occurred during wrongdoing.
A scope of techniques, including photography, planning, and estimating, might be utilized in the reproduction, which depends on the actual proof found at the crime location. Reproducing a prime location is expected to offer a legitimate and verifiably precise record of what happened that might be utilized as proof in court. The reproduction is used to explain and feature different bits of proof for the situation since it is viewed as illustrative proof. Proficient detectives concentrate on the scene and proposition an exhaustive reproduction of the occasions that occurred utilizing a blend of logical and criminological methodologies.
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help me do this and ill give 10 points
What is the difference between these power plants of their pollution?
James H. Miller Jr. Electric Generating Plant in Alabama, which burns coal, is the most polluting power plant in the US.
Which power plant is the most pollutant-producing? James H. Miller Jr. Electric Generating Plant in Alabama, which burns coal, is the most polluting power plant in the US.The amount of carbon dioxide (MtCO2) released by the Miller Plant in 2021 was around 23 million metric tons (MtCO2), an increase of 22% from the year before.About 1,400 electric generating units (EGUs) that burn coal and oil are included in the 600 power plants that are subject to these regulations.They release dangerous pollutants such as dioxin, mercury, and non-mercury metallic hazardous metals.The growth and survival of specific vegetation communities may be impacted by the air pollutants and water vapor that power plants release into the atmosphere as fog.Some pollutants cause diseases that harm or kill plants or are toxins that harm them.To learn more about power plant refer to
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Unlike most of the other muscles in our bodies, the masseter muscle in the jaw, as illustrated in the figure, is attached relatively far from the joint, enabling very large forces to be exerted by the back teeth. This is shown in the figure below, where a person is biting down on a bullet placed between the back teeth. (F_M = 225 N and r_R = 4.1 cm.) Using the information in the figure, calculate the magnitude of the force exerted by the teeth on the bullet. Calculate magnitude of the force on the joint.
The torque represents the force on the joint, the magnitude of the force on the joint is 922.5 Ncm.
The magnitude of the force exerted by the teeth on the bullet is given as F_M = 225 N.
To calculate the magnitude of the force on the joint, we need to determine the torque produced by the force F_M at the radial distance r_R = 4.1 cm from the joint.
Torque = Force x Radius
= F_M x r_R
= 225 N x 4.1 cm
= 922.5 Ncm
Since the torque represents the force on the joint, the magnitude of the force on the joint is 922.5 Ncm.
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Which type of cnidarian is the Portuguese man-of-war?
Select one:
A- Jellyfish
B- hydroid
C- coral
D- nemone
Jellyfish cnidarian is the portuguese man of war. The correct option is A
What is cnidarian?Cnidaria is a phylum under kingdom animalia containing over 11,000 species of aquatic animals found both in freshwater and marine environments.
Characteristics of Cnidarian are :
All Cnidaria are aquatic mostly marine organisms.They all have tentacles with stinging cells called nematocysts that they use to capture food. Cnidarians only have two body layers the ectoderm and endoderm separated by a jelly-like layer called the mesoglea. Most Cnidarians have radial symmetryTherefore Cnidarian muscles play crucial roles in locomotion, defense from predators e.g contracting and burying in crevices and sand feeding and digestion through continuous peristaltic movements.
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carried by ticks and transmitted through bite of an infected tick
What type of parasite is often carried by ticks?
The central nervous system consists of the brain and spinal cord.The brain and spinal cord are the two components of the central nervous system.
The peripheral nervous system is composed of nerves that emerge from the spinal cord and cover the entire body. The majority of your senses are fed information by PNS into your brain. You can move your muscles thanks to the signals it transmits. The brain uses signals from your PNS to command essential, automatic functions like breathing and pulse. An upper motor neuron transmits motor information from a region of the brain down the spinal cord. From the brain to the brainstem, upper motor neurons can also travel.
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Which of these are genes that have more than two alleles?
O the gene for plant height in pea plants
O the gene for flower color in pea plants
O the C gene for melanin production in rabbit coats
O the genes found in the human mitochondria
Answer: the C gene for melanin production is rabbit coats.
Explanation:
if glucose labeled at c-1 with 13c is the substrate for glycolysis in yeast cells, the labelled 13c soon appears in c-1 and c-6 of fructose-1,6-bisphosphate. explain how this isotopic scrambling occurs.
The accomplishment, or the most common way of accomplishing, harmonious dissemination of isotopes inside a predetermined format of molecules in synthetic animal types or gathering of substance species.
Isotopes are particles that have a similar nuclear number (and, consequently, by and large, a similar science) but unique mass. The distinction in mass turns out to be synthetically significant in specific occurrences. For instance, when a carbon-hydrogen bond is supplanted by a carbon-deuterium bond (deuterium being…
A dynamic isotope impact is an unthinking peculiarity wherein isotopically subbed particles respond at various rates. Understanding the rate distinctions gives data on the idea of the rate-deciding step.
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what is the name of the layers of the cell membrane?
The name of the layers of the cell membrane is Phospholipid Bilayer.
The plasma membrane is composed specifically of phospholipids, which encompass fatty acids and alcohol. The phospholipids inside the plasma membrane are organized in two layers, called a phospholipid bilayer, with a hydrophobic, or water-hating, indoors and a hydrophilic, or water-loving, exterior.
The mobile membrane consists of layers, the internal and outer phospholipid layers. The internal layer consists of fatty acid tails, which might be hydrophobic (meaning they repel water) and the outer phospholipid layer consists of polar heads that are hydrophillic (which means they absorb water.)
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Phospholipid Bilayer is the term for the cell membrane's layers.
Particularly phospholipids, which include fatty acids and alcohol, make up the plasma membrane. The phospholipids in the plasma membrane are arranged in two layers, or phospholipid bilayers, with an interior that is hydrophobic (hates water) and an exterior that is hydrophilic (loves water).
The internal and external phospholipid layers make up the layers that make up the mobile membrane. The exterior phospholipid layer is made up of polar heads that are hydrophillic, and the inside layer is made up of fatty acid tails that may be hydrophobic (meaning they reject water) (which means they absorb water.)
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any one have a file for natural selection lab
These experiments are designed to test general theories about the genetic basis of developmental and life-history traits by examining patterns of phenotypic changes and correlations that emerge under specific selection regimes.
What is Natural selection lab?The laboratory describes the broad category of natural selection experiments that we refer to as selection experiments that include all experiments that use selection pressure to change populations over time.
Laboratory natural selection is currently heavily used in this setting, with its use in applied studies making a significant difference, when compared to other selection experimentation methods such as artificial selection and directed evolution.
Thus, these experiments are designed to test general theories about the genetic basis of developmental and life-history traits by examining patterns of phenotypic changes and correlations that emerge under specific selection regimes.
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Describe the shape of the eastern mole’s hands
The eastern mole has hands that are adapted for digging and tunneling. They have short, broad, shovel-like forepaws with long, curved claws.
What is eastern mole?Eastern mole (Scalopus aquaticus) is a species of mole found in the eastern United States and parts of Canada. It is a small, burrowing mammal that lives in moist soils and feeds on insects, worms, and other small invertebrates. It is active both day and night and can be found in many different habitats, from grasslands to woodlands.
The front paws are larger than the hind feet, which are adapted for pushing dirt. The palms and digits are flattened and spread out for maximum contact with the ground. The claws on the front feet are long and curved, allowing them to dig and scoop the dirt away, while the claws on the hind feet are slightly curved and more flattened. The eastern mole’s hands are highly specialized for digging and tunneling, which is the mole's primary activity.
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Plants are classified based on the presence of a certain specialized tissue. a specialized tissue called_____tissue helps transport_____and water to all parts of the plant.
Answer:
Plants are classified based on the presence of a certain specialized tissue. A specialized tissue called xylem tissue helps transport water and dissolved minerals to all parts of the plant.
Explanation:
Xylem is a complex tissue in plants that is responsible for the transportation of water and dissolved minerals from the roots to the leaves and other parts of the plant. It is composed of several different cell types, including tracheary elements and parenchyma cells. The tracheary elements have thick walls and are dead at maturity, they are responsible for the transportation of water and dissolved minerals. The parenchyma cells support the tracheary elements and also store food.
Xylem is one of the two types of transport tissue in plants, the other one is called phloem, which is responsible for the transportation of sugars and other organic compounds throughout the plant.
Answer:
blood
Explanation:
oxygen with food and nutrients
looking at a cell under a microscope, you note that it is a prokaryote. how do you know? group of answer choices the cell lacks a nucleus. the cell lacks cytoplasm. the cell lacks genetic material. the cell lacks a cell membrane
Option 1 is Correct. You can tell a cell is a prokaryote by looking at it under a microscope since it has no nucleus.
Prokaryotic cells lack organelles, have no nucleus, and are significantly smaller than eukaryotic cells. A cell wall protects every prokaryotic cell. Many additionally include a polysaccharide-based capsule or slime layer. Prokaryotes frequently have protrusions (appendages) on their surface.
There's no nucleus in the cell. Organelles that are attached to membranes and a real nucleus are absent from the cellular structure of prokaryotic species. All of the cells are prokaryotic. This indicates that they lack a nucleus or any other membrane-enclosed structures. A light microscope may enable the observation of larger bacterial cells.
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Correct Question:
Looking at a cell under a microscope, you note that it is a prokaryote. how do you know? group of answer choices
1. the cell lacks a nucleus.
2. the cell lacks cytoplasm.
3. the cell lacks genetic material.
4. the cell lacks a cell membrane
The cell can be recognized as a prokaryote under the microscope because: (1) the cell lacks a nucleus.
Prokaryotes are the organisms that possess a prokaryotic cell. A prokaryotic cell is the primitive type of cell that does not possess a nucleus. Instead, it comprises of a mass of genetic material called nucleoid that lies openly in the cytoplasm.
Nucleus is the cell organelle present only in the eukaryotic cells. It regulates each and every function of the cell. The nucleus is a double membranous structure with small pores in it called the nuclear pore. The nucleus is comprised of the genetic material of the cell.
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Please help me in question 9 and 11
in which stage of mitosis adn meiosis are the principles of segregation and indipendent assortment at work
Stage of mitosis and meiosis when the principles of segregation and independent assortment are at work : in anaphase I of meiosis, each pair of homologous chromosomes segregate independently of all the other pairs of homologous chromosomes.
At what stage are the principles of segregation and independent assortment at work?The principles of segregation and independent assortment are at work during meiosis. Segregation refers to the separation of homologous chromosomes during meiosis I, whereas independent assortment refers to random alignment of chromosomes during meiosis I, which leads to formation of genetically diverse gametes. These principles do not occur during mitosis, as during mitosis the cell only makes an exact copy of its chromosomes and no genetic recombination takes place.
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Phosphorus-32 has a half-life of 14. 0 days. A 40. 0g sample is being shipped. If it takes 27 days to arrive, how much p-32 remain upon delivery
There will be 0.25 g of phosphorus-32 left over. A radioactive isotope's nuclear half-life measures how long it takes for a sample to decay to half of its original value.
In your situation, after 14.0 days, you will still have half of the initial mass, regardless of how much phosphorus-32 you started with. You'll have half of what you did after the first 14 days, which is equal to one-fourth of the starting mass, after another 14 days. Only half of the original amount of phosphorus-32 is left after 14 days since the other half has decomposed. Half of the residual sum (or one-fourth of the initial sum) is still left after an additional 14 days.
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There will be 0.25 g of phosphorus-32 left over. A radioactive isotope's nuclear half-life measures how long it takes for a sample to decay to half of its original value.
In your situation, after 14.0 days, you will still have half of the initial mass, regardless of how much phosphorus-32 you started with. You'll have half of what you did after the first 14 days, which is equal to one-fourth of the starting mass, after another 14 days. Only half of the original amount of phosphorus-32 is left after 14 days since the other half has decomposed. Half of the residual sum (or one-fourth of the initial sum) is still left after an additional 14 days.
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